Garage Door Chain Sprocket Broke

Chain drive garage door openers have a sprocket that is attached at the top of the motor.

Garage door chain sprocket broke. This is the part that connects the motor to the chain or belt. This can be easily replaced by a garage door service technician. It wasn t listed for the same model but after looking online it seems that most garage door openers made after 1984 use the same sprocket assembly. The bag said it was an oem piece.

One of the most common repairs on a liftmaster garage door opener is a broken gear sprocket. Over time the sprocket s teeth can wear and the chain may jump or skip when the opener raises the door. Liftmaster and chamberlain garage door openers are very common for this. If the gear and sprocket assembly breaks the motor runs but the door won t move.

You can put the chain back on your automatic garage door opener using a simple adjustment mechanism. This diy repair guide explains how to replace the gear and sprocket assembly on a chain drive garage door opener. The gear and sprocket assembly is inside the cover of the garage door opener motor. Chain driven garage door openers should have some slack in the chain for optimal performance.

It was a perfect replacement and the garage door is working. This was a craftsman model 139 53976srt. Your garage door opener has a gear and sprocket that will eventually fail. After several years the garage door springs become weaker causing more stress on this particular part causing it to fail and wear out.

This is a video on how to change the gear sprockets in a craftsman garage door opener. The most common cause of a chain being loose and appearing broken is a broken gear and sprocket.